Hello All,
I am new to the world of PostGIS and GDAL, but I'm looking for some help. I've researched and it appears that gdalbuildvrt is supposed to be able to resolve overlap areas when "no data values" are defined for the sources, but I am unable to produce the expected results. Where elevation raster values exist in the overlap areas, the values on both tiles are the same, so I have no need for a computational mosaic, simply a merge of the data which pays no attention to "no data" in either source raster. I've tried the following workflow: 1. Set No data values to -999 gdal_translate -ot float32 -of gtiff -a_nodata -999 in_original.tif out_nodata_defined.tif 2. Build VRT with specified source no data value gdalbuildvrt -srcnodata -999 -hidenodata out.vrt out_nodata_defined.tif Am I doing something wrong? <http://www.unb.ca/fredericton/forestry/people/ogilvie.html> Jae Ogilvie, Research Associate Faculty of Forestry & Environmental Management University of New Brunswick 28 Dineen Drive Fredericton, NB Canada E3B 6C2 Tel. 506 451 6823 Fax. 506 453 3538 Web <http://watershed.for.unb.ca/> http://watershed.for.unb.ca/ This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail.
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